rtp_EasyRtpV10-v1.pdf

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This page is a construction design for the Easy-RTP V1.0 board. This is the single sided design for a DS1230 style 28 pin DIP

NVSRAM . You can find the eagle design files attached in a zipfile at the end of this thread.

Brief Explanation

Parts list:

Construction:

Brief Explanation

A quick explanation: the "optional components" are only required if you want 27C256 emulation. This is intended for those who do

not have an EPROM programmer capable of natively programming their NVSRAM of choice. Most programmers "28C256" setting

seem to do the trick nicely, FYI. (Tested with Willem by Calvin and the Batronix by gimpy... Gimpy sez you have to disable the blank

check for it to work)

picture of board layout in eagle:

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PGMFI.ORG - Grassroots ECU Development - Library . EasyRtpV10

Parts list:

DS1230Y or similar TI, ST, Simtek, ZMD, ... 32K 28 pin .600" DIP NVSRAM

74HC00 DIP package quad NAND gate

2x 0.1 uF ceramic caps (decoupling)

2x 10K resistors

2x 1x14 pin headers or similar contraption to make contact with ECU socket

Optional components: (required for 27C256 emulation)

1x 10K resistor

1x 100k resistor

1x generic NPN switching transistor (2N4401 or equivalent)

1x switching diode (1n4148, etc... not too picky.)

Construction:

First off, orient your board with the traces facing up. (bottom up)

If you have the two 28 pin footprints facing right, the top set of holes (that are also larger diameter) are the ones to use for the ECU -

board connectors. Solder in place the 2 - 1x14 pin headers (I'm ghetto, fuck off.) or whatever other contraption you are using to

connect the board to the ECU in place and continue.

Orient your board with the traces on the BOTTOM. Look at the top of the board (no traces). Orient your board so the 3 pin

jumper connector faces left and the double 27C256 face right. This is the orientation in which all the following instructions

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PGMFI.ORG - Grassroots ECU Development - Library . EasyRtpV10

will assume you are looking at the board.

Next, solder in a 28 pin DIP socket for the NVSRAM in the top set of holes. The notch will face left.

Next, solder in a 3pin - pin header or 3 wires for J1.

Next, solder the two caps C1+C2 in place.

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PGMFI.ORG - Grassroots ECU Development - Library . EasyRtpV10

Next, solder in R1 (10k, to the left) and R2 (10K, center).

Next decide whether you want/need 27C256 emulation.

IF YOU DON'T WANT 27C256 EMULATION:

Solder in a wire link or 0-ohm resistor for D1

Skip to FINAL STEPS .

IF YOU DO WANT 27C256 EMULATION:

Solder in the NPN switching transistor Q1.

l Solder in R3 (10k - top resistor)

Solder in R4 (100k - bottom resistor)

continue...

FINAL STEPS :

Solder in the 74HC00 Latch

Place the NVSRAM in the 28 pin DIP socket

Final board

You can download the design or full size versions of any of the images:

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l Solder in the switching diode for D1.

PGMFI.ORG - Grassroots ECU Development - Library . EasyRtpV10

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easyrtpv1-eagle.

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21 Feb 2004 -